Telegraph-transmitter.



'0. E. SGRIBNER.

TELEGRAPH TRANSMITTER.

APPLICATION FILED NOV. 28, 1911.

1,75,5@3, Patented 001111913.

2 sums-sum 1.

G. E. SGRIBNER.

TELEGRAPH TRANSMITTER.

APPLICATION FILED NOV. 28, 1911.

1,075,503. Patented 001;.14,1913.

2 SHEETS-SHEET 2.

UNTTED STATES PATENT QFFTQEQ CHARLES E. SCRIBNER, or JERIQIHO, vnnl'vronr, as's reuon tt'o WESTERN ELECTRIC COMPANY, OF NEW YORK, n. Y., Aeom'onarxon or ILLInoIs.

TELEGRAPH-TRANSMITTER.

rotates.

specification of Letters Patent.

Patented one ML, 1913.

Continuation of application Serial 310. 648,351, filed S ptihher 8,1911. This application filed November To all whom it may concern: 4

Be it known.that I, CHARLES E. SCRIBNER, citizen of the United States,residing at Jericho, in the county of Chi ttenden and State of Vermont,-have invented a certain new and useful Improvement in TelegraphTransmitters,- of which the following is a full,- clear, concise, andexact description. 7

This invention relates to printing telegraphs, and more particularly toa printing telegraph transmitter in which the impulses used to selectcharacters at the receiving end of the line are transmitted over a linecomposed of two main line conductors with a ground return.

Thisapplication is a continuationof my copending application, Serial No.648,351, filed September 8, 1911.

The object of this invention is to provide an improved transmitter inwhich a combination of two direct current impulses is sent to thereceiving station over one or both of the main line conductors and inwhich the duration of the interval between impulses and the duration ofthe second impulse are automatically determined irrespective of the willof the operator, To the above end contacts are provided whichautomatically select means for controlling the first of a pair ofcurrent impulsesand at the same time operate and select m ans whichcontrol the interval be tween impulses and determine the character ofthe second impulse.

In the drawings-Figures -1 and 2 c0mbined illustrate a completetransmitting system embodying my invention, and in which so much of thekey structure as is necessary to understand the operation thereof isshown in perspective.

The system operates generally in the following manner :The key isdepressed to send a combination of selecting impulses to the main line,and on its upward stroke closes the contacts 89, 92, 93, selecting andestablishing a circuit through one of the series of current controlrelays 150 to 153 inclusive, through a selected one of the predeterminedimpulse means 154 to 159 inclusive, through the interval relay 160, andto ground. This operation places the battery 103 .on the line for aperiod of time determined by the length 0t time necessary forthe'dcpressed key lever to return to its nor- Serial No. 662,843.

successive impulses. When the armature of this'interval relay reachesits retracted position a circuit through a current control relayselected by the locked up predetermined impulse means is closed, thiscircuit passing through a second impulse relay 1,61. The battery103 isthus placed to linea second time, the duration of this second impulsebeing measured by the time necessary for the second impulse relay toattract its armature, at which time the locking circuit through theselected predetermined impulse I means is broken and all return tonormal.

. The two keys shown in detail in Fig. 1 are designated by the numerals33 and 35. The remaining keys are identical in structure with the keys33 and 35, and it is considered unnecessary to designate any of theremaining keys except the key 52 used for transmitting theselectingimpulses for the letter 0,? and the keys 41, 42 and 66 which are usedfor transmitting the impulses for resetting and restoring the mechanismat the receiving end or for providing a space be tween words or letters.

The key by which the letter A, is sent is designated by the numeral 33,and a description of this key will be sufiicient for the others.,- Thekey 33 is pivoted on a shaft 71 a'ndis capable of verticalmovement,"being guided in such movement by a slot in the front plate 72.The key is held in its normal position by the spring 95. Immediatelybeneath the key is a transverse rod 73 having rearward extensions 74,one of whichis shown journaled at 75 on the pedestal 76,- and hold inits normal position by the spring 77. At the outer extension of the rod73 is a pin 79 working in a slot 80 of a plate 81, which plate isjournalcd on therod 82. On the outwardly extending arm 83 of the lateparts of the device -81 is a hollow plunger 84% which moves own upon therod 85. .Slidably mounted on the rod 85 and positioned between the arm83 I and the lower extension of the plate 81 is an I which the variouscontacts 92 and 93 may be conveniently connected by conductors 96 and 97in accordance with the difierent combinations of impulses to betransmitted. A series of current control relays 150 to 153 inclusive,each having two energizing coils, is provided for controlling theapplication of the current source 103 to the main line conductors L andL The energizing coils are connected to the conductors 10, 20, 30, 4:0,50 and 60 in such a way'that they maybe energized by current frombattery 98, either singly or. in any predetermined of a combination.

group in accordancewith the combination of impulses to be transmitted.

Included in the circuit of the one or a group of the current controlrelays 150 to 153 inclusive selected by a key is one of a series ofpredetermined impulse relays 154C to 159 inclusive, which relays areused to select a predetermined one, or group of the current controlrelays 150 to 1525 inclusive to send the. second impulse of acombination of impulses. The energizing coils of these predeterminedimpulse relays are'connected to conductors 1 to 6 inclusive. Thesepredeterlnined impulse relaysare also provided with locking windingswhich enable the selected relaysto remain in opera-ted condition afterthe cessation of the first impulse They also determine through theirvarmatures which one or group of the series of current control. relayswill be utilized to send the second impulse of the combination.

Numeral 160 designates an interval relay which is energized in serieswith the selected one or group ofcurrent control relays and the selectedpredetermined impulse relay. This relay is of the slow release type andis provided for determining the duration of the interval betweensuccessive impulses. The time taken for this relay to become fullydeenergized and thus permit its armature-to fallto retracted positionmay be enceedingly short, but is nevertheless oi definite andapproximately constant duration and ieterminesabsolutely the timeelapsing between successive impulses. A second impulse relay 161 is alsoprovided and controls the duration of the second impulse to betransmitted to the main line conductors by completing a shunt circuitaround the locking circuit of the selected one of the predeterminedimpulse relays. This relay is made slow-acting by having the resistance99 inparallel with its energizing winding,

and the time necessary for the relay to become fully energized andattract 1ts armature .is of definite duration. As in the case of theinterval relay above referred to, this time may be exceedingly short butis nevertheless of definite duration and determines absolutelv thelength of the second impulse.

The character of the impulses which result from the depression of any ofthe keys shown may be varied as necessary to produce the desired resultat the receiving mechanism situated at the distant end of the line. Thatis to say the first impulse may be posi-- tive battery impressed oneither of the main line conductors L or L it may be negative batteryimpressed on either line L or line I or it may be positive batteryimpressed on L and L simultaneously. The second impulse likewise mayhave any of the char acteristics of the first impulse. In the preferredform of the invention, however, the first impulse of a combination willnever be negative battery impressed upon both the conductors L and Lsimultaneously, as this form of impulse when not preceded by some otherform of impulse and the usual time interval is assigned to and usedexclusively for the purpose of producing upon the printing mechanism aspace or spaces between succeeding characters.

If it is desired to send the letter A the key corresponding to thisletter is depressed, which depression causes an outward movement of theupper extension of the key 33, making contact between the springs 92 and93. At the same time the rod 73 is depressed and the pin 79 working inthe slot 80 of the plate 81 carries said'plate downward moving theplunger 84 into contact with the insulating member 87, forcing saidmember out from engagement with the springs 89.

Springs 89, however, do not contact with other a clrcuit is closed whichmay be traced from battery 98, lower winding of current control relay151, conductor or busbar conductor 96, contacts 92, 93, conductor 97masses conductor or busbar 3, energizing winding of the predeterminedimpulse relay 156, interval relay 160, conductor 91, contacts 89, toground. This circuit causes the energization of the current controlrelay 151, the predetermined impulse relay 156 and-the intor-val relay160. Current control relay 151 places positive battery on the line Lwhich will remain on line L until the depressed key lever returns to itsnormal position.

of" the predetermined impulse relay 156,

armature of the interval relay 160, through the energizing winding ofthe second impulse relay 161, andthe resistance 99 in parallel toground. 1 Positive battery is again put to line L trom the currentsource 103 which will continue until the relatively'slow-acting relay161 has fully attracted its armature. Whenthis occurs a shunt is placedaround the locking circuit of the predetermined impulse relay 156,thereby breaking the energizing circuit for the current control relay151 at the upper armature of the predetermined impulse relay, and thesecond impulse of the combination of impulses ceases.

In the case assumed the operation of the key appropriate to the letter Asends two positive impulses over the same line conductor, such impulsesbeing separated by an interval of no current. The operation of the keyfor the letter 0, however, which will be next described, sends apositive impulse over L and L simultaneously for the first impulse, thenan interval of no current, after which the second impulse is sent whichconsists of negative current sent over L If the key controlling theimpulses for sending the letter 0- is depressed plunger 84 displaces themember 87' from between the contact springs 89, and on the upward strokeof this key the springs 89 close a circuit which may be traced frombattery 98 through the lower energizing winding ofcurrent control relay150, and the upper energizing winding of current control relay 151 inparallel, conductor or busbar 50, conductor 96, contact springs 92 and93- of the f conductor 97 conductor or 1 spectively with the plates 116and 117.

When the pin 119 has reached its lower p0 A sition it has passed belowthe point 126 334 appropriate key, busbar 2, energizing wmding of theprede: termined' impulse relay 157, interval relay 160, conductor 91,contact springs 8:910

ground. The energiaation ofthe' current control relays 150 and 151places positive battery 103 to the main line conductors L and Lsimultaneously. As before, the

duration of this impulse is determined by the key lever reaching itsnormal or upward position. Predet-ermined impulse relay 157 energizedand locked'up. The interval relay 160 which was energized by the circuitabove traced allows its armature to retract thus determining, as in theprevious case, the duration of the interval between impulses. When thearmature of interval relay 1.60 reaches its back contact a circuit isclosed from battery 98, upper energizing winding of current controlrelay 152, the'upper armature of predetermined impulse relay 157,armature of intervalrelay 160, through the second impulse relay 161 andthe resistance 99- in parallel to ground. The closure of this circuitenergizes the current control relay 152 and places negative battery fromthe current source 163 to the main line confl duntor L The duration ofthis impulse is, as above described for the letter A, determined by thetime necessary for the second interval relayto fully attract itsarmature, which attraction places a shunt around the locking circuit forthe predetermined; impulse relay 157, deenergizing said switch andsending all parts of the device back to normal position.

In order to provide means for printing the alternate charactersindicated on the 100 keys, a shift key is provided which when depressedwill so change the operation of the receiving mechanism that as long asthe key is maintained depressed nothing but such alternate receivingend. This key, shown in detail on Fig. 2 and designated by the numeral104, is pivoted on a shaft105, and held in normal position by the spring106. This shift key do the rest of the keys of the device. This keycarries two bell crank levers 107 and 108 pivoted at 109 and 110respectively, and held in normal position by'their springs 111 and 112,respectively. springs, designatedby the numeral 43, are composed o-tmovable plates113 and 11 1 spaced apart by-means of the insulating rod115. These two plates contact respectively with stationary plates 116and 117. The

plate 113 carries a cam surface 118 which contacts with an insulatingpoint 119 projecting from the upper arm of the bell crank lever 107. Thedownward movement of the key 104: will cause the pin 119 to ride over m5the cam surface 118, forcing both the plates 113 and 114; rearwardlyinto contact re- .aracters will be printed at the I also works in a slotin the front plate 72 as The shift key on plate 113 allowing springs 113and 114: to move out of contact with springs 116 and 117, respectively.On the upward movethe top of the cam it is pulled into its nor 'malposition against the stop 170 by the spring 111. The shift key is shownslightly depressed to illustrate clearly the relation of the pins 119and 127 with respect to the cam surfaces 118 and 126, respectively.

The back shift key springs, designated by the numeral 44, are composedof movable contact plates 121 and 122, spaced apart by means of theinsulating rod 125, and contacting respectively with stationary platesand 12 1. The plate 121 carries a cam surface 126 with which theinsulating pin 127, projecting from the upper arm of the bell cranklever 108, contacts on the up stroke of the switch key 104:. On thedownward movement of the key 10% pin 127 rides on the rear face of thecam 126, being forced rearwardly thereby and when the pin reaches thelowest point of the cam it is pulled into its normal position againstthe stop 171 by the spring 112. On the upward movement of the key 104,pin 127.1ides' on the cam surface 126 forcing plates 121 and 122 intocontact, respectively, with plates..123 and 124, and when the pin 127reaches the top of the cam, plates 121 and 122 spring into their normalposition out of con tact with plates 123 and 12 1, respectively. Thedepression ,of the shift key causes a combination of impulses to be sentover the line conductors to operate the. shifting mechanism at thereceiving station, and as long as this key is held depressed thealternate characters only, shown on the keys, at the transmittin end,are printed at the receiving end.

11 the up stroke of this shift key another combination of impulses issent to the receiving end which operates mechanism to restore thecharacter device to its normal position.

Reset and paper lift key 41, reset key 42, spacin key 66, and all theother character keys s own, operate to send appropriate combinations ofimpulses to line to actuate at the receiving end the reset and paperlift mechanism, the reset mechanism, and the spacing mechanism,respectively, but as they operate in precisely the same manner as thekeys heretofore described, a detailed description of their operation'isunnecessary.

From the abovedescription it will be seen that my invention involves animproved and novel system and apparatus for transmitting characterselecting impulses, positive or negative, or any combination-thereof,and in second impulse and the duration of the interval between impulsesbeing determined independently of the will of the operator. In everycase a manua'lly'operated' key' is depressed, which, after beingreleased by the operator, closes a circuit, energizing oneor a group ofa series of current control relays, and predetermined impulse relays;

Upon the release of the manually operatedunder the control ofelectromagnetic appa ratus.

I claim: 1. In an apparatus of the class described, a series ofswitches, key controlled means for momentarily actuating a predeterminedone of said series of switches, a selector also actuated by the keycontrolled means for actuating asecond predetermined one of said seriesof switches.

2. In anapparatus of the class described,

a series of switches, means for automatically operating selected ones ofsaid series of switches in predetermined succession in response to asingle initial act, said means including a key for momentarily actuatinga predetermined one of said series of switches, an interval determiningdevice also controlled by said key, and a selector operated by thereturn of the interval determining device to normal to actuate a secondpredetermined one of said series of switches.'

3. In an electrical impulse transmitter, the

combination with a series of switches, of

means for successively operating predetermined groups of said series ofswitches, said means including a key operated device for momentarilyactuating a predetermined.

group of said series of switches for sending an electrical impulse toline, an interval determining device controlled simultaneously with thegroup of switches and-operating, on its return to normal, a second-groupof the said series of switches, whereby a second electrical impulse issent'to line',and

the .duration of the interval between impulsesis automaticallydetermined.

4. 'In an electrical impulse transmitter for automatically sending asuccession of impulses to line as theresult of a single contactoperating action of a key, a-circuit including an interval relay, acurrent ..control-relay and a key operated interval contact, the

operation of the interval contact momentarily energizing theintervalrelay and cutrelay arranged to be completed through a back contact ofsaid interval relay upon the recovery of the latter from its momentaryexcitation, whereby said current control relay is automatically operateda second time.

6. In an electricalimpulse transmitter, a

source of current, a relay td intermittentlyconnect said source ofcurrent to line, a circuit for said relay arranged to be closed mo- 1mentarily by a key operated contact, a slow acting relay also in saidcircuit, and a second energizing circuit for the first relay independentof the key operated contact completed atv the back contact of said slowacting relay, whereby the first relay is automatically again excited asthe slow acting relay recovers upon the opening of the key operatedcontact.

7. In an electrical impulse transmitter, the combination with a mainline, of a local circuit including a key controlled contact, a currentcontrol relay, a predetermined impulse relay, and an interval relay; asource of current momentarily connectedto said main line upon theactuation of the' key controlled contact; a circuit including thearmatures of said interval and predetermined impulse relays, and saidcurrent control relay for automatically excitings'aid current controlrelay, the energization of the,cur-

rent control relay again connecting said source of current tothe mainline.

8. In an electrical impulse transmitter, a

key, a pair'of impulsecontacts controlled by said key, a circuitincluding said pair of contacts, an interval relay, a predeterminedimpulse relay, and a current control relay a main line, a source ofcurrent controlled by the armature of said current control relay to sendan'impulse over the main line during the closure of saidiinpulsecontacts; a locking circuit for said predetermined impulse relay holdingthe relay energize irrespective of the condition of the impulse rcontacts; a second circuit closed upon the deenergization of saidinterval relay and including the armature of said predetermined impulserelay, and the current control relay, closure of this last named'circuit energizing the current control relay and againconnecting saidsource of current to said line.

9. In an electrical impulse transmitter, a key, a pair ofimpulse'contacts controlled by said key, a circuitincluding said pair ofcontacts, an interval relay, a predetermined impulse relay, and acurrent control relay;

a main line, a source of current controlled.

by the armature of said current control relay to send an impulse overthe main line during the closure of said impulse contacts; a lockincircuit for said predetermined impulse re ay holding the relay energizedirrespective of the condition of the impulse contacts; a second circuitclosed upon the deenergization of said interval relay and including asecond impulse relay, armature of said predetermined impulse relay, andthe cur rent control relay, closure of this last named circuitenergizing the current control relay and a ain connecting said source ofcurrent to said line, and a shunt circuit for the said locking circuitclosed at the front contact of the second impulse relay when the same isenergized, whereby the duration of the second impulse is determined.

10. In a transmitter of the character described, the combination of amain line, a

source of electricity, a series of switches for applying varyingimpulses to said line in succession, means for se ecting pairs of saidswitches including a local circuit, a branch circuit including contactscontrolled by a relayinthe local circuit to determine the second switch,to be operated; and means for closing said local circuit through thecontact operated by said relay.

11. Ina transmitter of the character described, the combination of amain line, a source of electricity, a series of electromagnetic switchesfor applying varying impulses to said line in succession, means forselecting a pair of said switches including a local circuit, an intervalrelay, a branch circuit having an ,electr'omagnet therein, said branchcircuit includin contacts controlled by said interval relay t e coil ofone of said electromagnetic switc s, and a contact controlled by anelectromagnet in the branch circuit; and manual means for closing saidlocal circuit through said interval relay and closing the contactoperated by said electromagnet. I t

a 12. In a transmitter of th class described, the combination of a maini e, a source of electricity, a series of e ectrom gnetic switches forapplying varying impu lses to 'said line in sucoess'on, means forselecting a pair of said switc es including a local circuit, an intervalrelay, a branch circuit including contacts controlledby said intervalrelay,.the coil of one of saidelectromagnetic switches and a contactcontrolled by a relay in a branch circuit to determine the secondelectromagnetic switch to be energized; and means for closing said localcircuit through lsaid interval relay and the contact operated by saidrelay.

13. In a device for transmitting electrical impulses, the combinatlon ofa main line locking circuit for said predetermined 'im;

comprising two conductors and a return lead, a source of current, .alocal circuit including a plurality of means for controlling theconnection of said source of current in "termitt'ently to said main lineduring a predetermined interval of time, and means for automaticallyproviding a constant interval between connections.

14. In an electrical impulse transmitter for transmitting signalscomposed of but two impulses, the combination of two main lineconductors, a source of current adapted to be connected to saidi'nainline conductors, a plurality of current controlling means, means forselecting any combination of such means, a predetermined time impulsemeans controlled by said selecting means and. de fining the duration ofan impulse sent over a line conductor, a circuit including a timeinterval relay and means for predetermining any second combination ofsaid current controlling means, and a second circuit including means foroperating the current controlling means and for determining the durationof the second impulse.

15. In an electrical impulse transmitter, the combination with a mainline comprising two conductors and a return lead, of a source of currentadapted to send positive current simultaneously over both main lineconductors, a local circuit including a plurality of means forconnecting said source of positive current to said main line conductorsduring a predetermined interval of time, said local circuit alsoincluding means for determining the duration of'asecond impulse, meansfor determining the duration of the pause elapsing between the twoimpulses, and means for predetermining a plurality of the currentcontrolling means for sending the second positive impulse simultaneouslyover the main line conductors.

16. In an electrical impulse transmitter, a main line, a source ofcurrent adapted to be intermittently connected thereto, in combinationwith a series of current control relays for intermittently connectingsaid source of current to said line, a key operated impulse contact toselect predetermined groups of said series of-current, control re-.

lays, and means for automatically PI'OVid'.

ing a gconstantinterval between connections,

17. In an electrical impulse transmitter, the combination with main ;1in empi-i ing-two, conductors and areturn lead, of'a seriesof: currentcontrolrelays; Yaseries of p 1 predetermlned impulse relays; alocal"circuiti in'cluding a pair ofcontacts, apair of impulse, contacts, agroup of. said-series of; current control'relays, a 'predeterminedim-ipulse relay, and a time'interval' relay; a

pulse relay; a source of current adapted to apply an impulse to themainline conduc I controlrelays, and mcansior 'comple c1rcu1ttosenda secondimpulse,

tors upon energization of said group of current control relays, theduration of such impulse being determined'by said pair of impulsecontacts; and a second circuit established upon the deenergization ofsaid inter val relay a definite period after the opening of said firstcircuit, said second circuit including a second impulse relay, contactsof the said predetermined impulserelay and a group of current controlrelays, the cnergiza tion of such group of current control relaysapplying a second impulse from said source of current to said lineconductors and the energization of said second impulse relay after adefinite interval restoring said current control and predeterminedimpulse relay to normal.

18. In a prlnting telegraph transmitter,

the combination with'a local circuit including a current control relay,bridging contacts, a predetermined impulse relay, a time interval relay,and a pair of-impulse con-. tacts; of key operated means to momentar lyclose said bridging contacts and said pair of impulse contacts; alocking circuit for said predetermined impulse relay holding thepredetermined impulse relay energized irrespective of the condition ofeither the bridging contacts or the impulse cont-acts; a second circuitclosed upon the denergizat-ion.

of the time interval relay and including a second impulse relay, anarmature of the time interval relay, an armature of the predeterminedimpulse relay and the current I 7 control relay; a main line; and asource of current adapted to be connected to and disconnected from saidmain line upon the en'er; gization and denergization of said currentcontrol relay, the duration of an impulse transmitted to themain linefrom thesource of current, and the duration of the interval elapsingbetween impulses being determined independently of thewill of theoperator.

19. In an impulse transmitter aplurality of current control relays, aplurality of pre determined. impulse means greater in number than thenumber of current control relays, means for selectively operating one ora group of the plurality of current control relays and one of thepredeterminedimpulse means to transmit an impulse, said prede termaxe P1$ mean elq me pom in;

u u mu sne ra p etthe @ua' r L f 204 mm; rifl s ire a sw r of currentcontrolrelays, a plurali.

la'flpl army-12o 0f are: determined impulse relays; greater in mm: 1

ber than the numberfoi't current control re-., lays, means-forselectively operating one or a plurality of currentcontml relays; andone of the '-'predetermined; impulse relays to through one of thecurrent control relays, ano pecans for completing the circuit to send asecond impulse.

.21; In an impulse transmitter for transmitting a plurality ofcharacteristic im-.

pulses, the combination of a series of predetermined impulse relaysequal in number to the number of characteristic impulses to betransmitted, a source of current, current control relays less in numberthan the number of impulses, key operated means controlling the circuitthrough one or a group of the current control relays and a predeterminedimpu'lserelay, and a second circuit through one or a group of thecurrent control relays under the control of the energized predeterminedimpulse relay. I

221 In an impulse transmitter a plurality of current control relays, aplurality of pre determined impulse relays greater in number than thenumber of current control relays, means for'selectively operating'one ora group of the plurality of current control relays and one of thepredetermined impulse v relays to transmit an impulse,'saidpredetermined impulse relay closing a'point in a circuit th'rough one ofa group of the current control relays, means for completing the circuitto send a second impulse, and.mean's cooperating with said predeterminedimpulse relays to determine the duration of the second impulse.

23. In a printing telegraph transmitter, v

trol means also operated thereby, said predetermined impulse meansshifting the control of said source of current to another one-or groupof the plurality of current control means to apply said source ofcurrent to the line conductors a second time.

In Witness whereof, I, hereunto subscribe my name this 21st day-ofNovember A. 1)., 1911.

CHARLES E. son mama.

Witnesses:

IRVING AoDoNALD, F. P. M INTOsH.

Copies of this patent may be obtained for five cents each, byaddressingthe Commissioner of Patents,

' Washington, D. 0.

